<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 200px;
            height: 200px;
            border: 3px solid #000;
            font-size: 30px;
            margin-top: 10px;
        }

        .pink {
            background-color: pink;
        }

        .big {
            width: 300px;
            height: 300px;
        }
    </style>
</head>
<body>

    <div id="app">
        <div class="box" :class="{ pink: true, big: true }">黑马程序员</div>
        <div class="box" :class="['pink', 'big']">黑马程序员</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {}
        })
    </script>
</body>
</html>